check out my spark plugs, please? - Alfa Romeo Forum
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check out my spark plugs, please?

Hi there!
Just a quick question about my NGK IRIDIUM plugs...

I'm running NGK IRIDIUM plugs with code:BPR6EIX
They work fine and the color is the normal brownish when you take them out the engine, but I'm afraid they might be a bit cold as the engine looses some performance when reaching around 90 degrees...

Any advice...
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yeah i use the platinum NGK plugs NGK BP6E-VG here in Australia an love them to bits

I dunno if it's any help but the number in the plug designation refers to the heat rating.

NGK use a bigger number to designate a harder plug (it runs at a lower temperature). If you're in Australia and revving the nuts off your motor in high ambient temperatures you can go to a "7" from a "6". E.g. BPR6-EV can be replaced by a BPR7-EV etc.

If you're driving around Sweden in winter, doing 20mph then the "7" plug will foul up with soot, so that's the flip side.

Champion use the reverse system. Their rating system has a "7" as the "softer" plug, so out Aussie thrasher would replace that with a "6".

The (B)PFR6B vs BP(R)6E-VG debate is academic:

The important stuff is:

B - the width of the threaded bit
P - Projecting nose electrode
R - Resistor Plug (recommended for reduced radio & ignition system interference)
6 - your heat rating
F - Platinum
VG - V-Groove electrode.

The E and the other B are anyone's guess, to do with the internal construction. The BPR6 is the important bit - these plugs are identical as far as the engine is concerned.
Thanx to Ralf S. for the info on another thread
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